The tactile (Merkel) disc would be located in the base of the epidermis and would detect light touch.
The Merkel disc is a main type of tactile end organ for sensing gentle touch and is essential for sophisticated sensory tasks, including social interaction, environmental exploration, and tactile discrimination.
Despite recent studies showing that Merkel cells in Merkel discs are main sites of mechanotransduction in response to tactile stimuli, it remains unclear how Merkel cells transmit tactile signals to Aβ-afferent endings, leading to tactile sensations.
Here we show that Merkel discs are serotonergic synapses in the epidermis, that tactile stimuli trigger serotonin release from Merkel cells to excite their associated whisker Aβ-afferent endings, and that this epidermal serotonergic transmission is critical to both electrophysiological and behavioral responses to tactile stimulation.
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